天然气勘探

层控网格层析速度建模技术在陆上盐丘区的应用

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  • 中国石油杭州地质研究院,浙江 杭州310023
王兆旗(1981-),男,河南唐河人,工程师,硕士,主要从事地震资料处理及方法研究. E-mail:wangzq_hz@petrochina.com.cn.

收稿日期: 2016-03-21

  修回日期: 2016-07-11

  网络出版日期: 2019-09-09

基金资助

国家自然科学基金项目“海洋一次波与多次波联合最小二乘逆时偏移”(编号:41504105)资助.

Application of layer-constrained grid tomographic velocity modeling in onshore salt domes area

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  • PetroChina Hangzhou Research Institute of Petroleum Geology,Hangzhou 310023,China

Received date: 2016-03-21

  Revised date: 2016-07-11

  Online published: 2019-09-09

摘要

陆上盐丘区盐下速度与围岩地层差异较大,且厚度横向存在较大变化,造成地震波场复杂。针对陆上复杂盐丘的地质特征和盐下速度建模的难点,提出了“层控网格层析速度建模技术”,层位约束较好解决了盐下速度异常问题,网格层析改善了速度准度,构造导向滤波提高了层析反演的精度。采用逆时偏移深度域成像技术,优选关键参数,实现了高角度反射界面、陡角度盐丘侧翼界面的反射波精确成像。上述方法解决了盐丘速度建模精度问题、盐丘侧翼的成像问题。消除了盐丘体对下伏地层的上拉效应,实现了复杂盐下地层的准确成像。

本文引用格式

王兆旗, 叶月明, 庄锡进, 陈见伟, 张金陵 . 层控网格层析速度建模技术在陆上盐丘区的应用[J]. 天然气地球科学, 2016 , 27(11) : 2070 -2076 . DOI: 10.11764/j.issn.1672-1926.2016.11.2070

Abstract

Because of large velocity variance between salt domes and surrounding rocks and large thickness changes in spatial direction,seismic wave field is very complex.According to the complex geological characters and difficulties of velocity modeling in onshore salt domes,we proposed an idea called “layer-constrained grid tomographic velocity modeling techniques”,which uses layer-constrained technique to improve the precision of velocity modeling,and uses dip-steered structure oriented filter to improve the accuracy of tomography inversion.That adopts reverse time migration in depth domain and optimize the key parameters,can precisely image the reflected waves from steep dip.Through the methods above,we can solve the problem of velocity modeling accuracy of salt dome,and the flank of salt dome.Therefore,the pull-up impact from salt domes on the underlying strata can be eliminated and accurate images of complex sub-salt targets can be achieved.

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